Evidence

"'I believe Jesus and what he said"'.
The problem here is "'How much of what he is supposed to have said was in fact his words?''.
Linguistic and historical biblical research over the past fifty years or so shows pretty conclusively that many statements attributed to him in the New Testament were written into the gospels by church groups to deal with political or religious issues at the time of writing. Recall that the first gospel was written at least forty years after his death, the last about seventy years later. Anybody interested in reading about this research should consult the publications of the Westar Institute in California (see their website).